The Minecraft world is huge and has three dimensions. The Overworld, Nether, End, and Nether are the main ones. You can access the Nether world via a Nether portal.
There are some things you should know before entering the Nether World.
The Nether produces fewer ores than the Overworld. The Nether is home to the most rare ore in Minecraft, the ancient debris. The Nether also produces Nether quartz ore.
This dimension has four structures: Nether fortresses and bastion remnants; ruined portals and nether fossils. Bastions and fortresses are dangerous places to be avoided by unprepared Minecraft players. They are home to hostile and ferocious mobs like piglin brutes, wither skeletons, and others.
Five biomes will be encountered when exploring the Nether: Nether wastes (crimson forest), warped forest (soul sand valley), and basalt deltas.
It is common to accidentally fall into large and small lava lakes in the Nether. Water buckets are not allowed here. Water that is placed by a player instantly evaporates. Beginners should always have a few Fire Resistance potions.
There are many hostile and neutral mobs in the Nether. This area only has one passive mob: the strider. In case you didn't know, hostile mobs are always aggressive towards players. Neutral mobs can do the same but only in certain circumstances.
To survive in the Nether, it is highly recommended that players have decent armor and weapons.
Many beginners make the error of trying to sleep in the Nether by taking their bed with them. It doesn't work as the beds explode when the player attempts to sleep on them. In most cases, it will kill the player instantly.